Find a solution with Laplacetransform

**1. The problem statement, all variables and given/known data**

Determine the solution for

when

U(t) is the unit step function

**3. The attempt at a solution**

Laplacetransforming :

With given data the equation becomes

Solving Y(s)

Transform again:

Problem: This is wrong but I dont know what am I doing wrong..Can someone tell me what Im doing wrong? Wolframalpha.com says that the solution should be:

But I dont understand how to get that answer.

Thanks!!

Re: Find a solution with Laplacetransform

Quote:

Originally Posted by

**Muffin** **1. The problem statement, all variables and given/known data**
Determine the solution for

when

U(t) is the unit step function

**3. The attempt at a solution**
Laplacetransforming :

With given data the equation becomes

Solving Y(s)

Transform again:

Problem: This is wrong but I dont know what am I doing wrong..Can someone tell me what Im doing wrong? Wolframalpha.com says that the solution should be:

But I dont understand how to get that answer.

Thanks!!

Your LT of the translated unit step is wrong

CB

Re: Find a solution with Laplacetransform

Okey thx! But still.. Something is wrong. I dont get the right answer

Re: Find a solution with Laplacetransform

Quote:

Originally Posted by

**Muffin** Okey thx! But still.. Something is wrong. I dont get the right answer

So what do you now get?

CB

Re: Find a solution with Laplacetransform

I get the same. When I inverstransform I get

Re: Find a solution with Laplacetransform

Quote:

Originally Posted by

**Muffin** I get the same. When I inverstransform

I get

What is:

?

That may not get you all the way to the solution but it might help.

CB